Multi-projector alignment refinement

A method of aligning two portions of an image, each of the portions of the image being projected by a first and second projector respectively on a surface, the method comprising:

• capturing an image of a calibration pattern from each of the first and second projectors projected on to the surface, the calibration patterns extending across the projection area of the first and second projectors;
• locating an overlap area of the first and second projectors according to locations of a plurality of calibration points in the calibration patterns, across the projection area, the overlap area comprising a predetermined location on the surface;
• for each of the first and second projectors, determining projector image coordinates at the predetermined location by measuring the captured image at the predetermined location using the calibration patterns;
• and
• aligning the two portions of the image according to the determined projector image coordinates for the first and second projectors.

A computer implemented apparatus for aligning two portions of an image, a first of the portions being projected by a first projector on a surface and a second of the portions being projected by a second projector on the surface to form respective projected portions of the image, wherein a calibration pattern is embedded in each of the two portions, the apparatus comprising:

• a processor;
• and a memory storing a processor executable software program for directing the processor to perform a method comprising the steps of:
• capturing from an image surface an image of the calibration pattern from each of first and second projected portions, the calibration pattern extending across a combined projection area of the first and second projectors;
• locating an overlap area of the first and second projected portions of the image according to locations of a plurality of the calibration points across the combined projection area;
• determining, using the calibration patterns projected on the surface, projector image coordinates dependent upon locations in the overlap area said locations being within in each of the first and second projected portions;
• and aligning the two portions of the image according to the locations of control points and the determined locations in the overlap area of the first and second projected portions.

A computer readable non-transitory storage medium storing a computer executable software program for aligning two portions of an image, a first of the portions being projected by a first projector on a surface and a second of the portions being projected by a second projector on the surface to form respective projected portions of the image, wherein a calibration pattern is embedded in each of the two portions, the program comprising:

• computer executable code for capturing from an image surface an image of the calibration pattern from each of first and second projected portions, the calibration pattern extending across a combined projection area of the first and second projectors;
• computer executable code for locating an overlap area of the first and second projected portions of the image according to locations of a plurality of the calibration points across the combined projection area;
• computer executable code for determining, using the calibration patterns projected on the surface, projector image coordinates dependent upon locations in the overlap area said locations being within in each of the first and second projected portions;
• and computer executable code for aligning the two portions of the image according to the locations of control points and the determined locations in the overlap area of the first and second projected portions.

A method of aligning two portions of an image, each of the portions of the image being projected by a first and second projector respectively on a surface, the method comprising:

• determining overlap image data corresponding to image data captured in an overlap area of the first and second projectors projecting a calibration pattern on to the surface, the overlap image data comprising image data projected by the first projector and image data projected by the second projector, wherein the overlap image data overlaps a predetermined location on the surface;
• for each of the first and second projectors, determining projector image coordinates at the predetermined location by determining a position in the calibration pattern at the predetermined location using the overlap image data;
• and
• aligning the two portions of the image according to the determined projector image coordinates for the first and second projectors.